On the variability of the quarter-diurnal tide in the MLT over Brazilian low-latitude stations
Abstract The characteristic features of the quarterdiurnal tide (QDT) in the mesosphere and lower thermosphere (MLT) are investigated using meteor radar observations from three low-latitude southern hemispheric stations, Sao Joao do Cariri (7.4°S, 36.5°W), Cachoeira Paulista (22.7°S, 45°W) and Santa...
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Online Access: | http://link.springer.com/article/10.1186/s40623-018-0910-9 |
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doaj-02232dcfb1534e568aa4d91d0426a4952020-11-25T01:40:09ZengSpringerOpenEarth, Planets and Space1880-59812018-08-0170111410.1186/s40623-018-0910-9On the variability of the quarter-diurnal tide in the MLT over Brazilian low-latitude stationsAmitava Guharay0Paulo Prado Batista1Ricardo Arlen Buriti2Nelson Jorge Schuch3Space and Atmospheric Sciences Division, Physical Research LaboratoryAeronomy Division, National Institute for Space Research (INPE)Federal University of Campina GrandeSouthern Regional Space Research Center-CRS/COCRE/INPE-MCTICAbstract The characteristic features of the quarterdiurnal tide (QDT) in the mesosphere and lower thermosphere (MLT) are investigated using meteor radar observations from three low-latitude southern hemispheric stations, Sao Joao do Cariri (7.4°S, 36.5°W), Cachoeira Paulista (22.7°S, 45°W) and Santa Maria (29.7°S, 53.7°W) in 2005. The QDT shows consistent appearance with a weak enhancement during late summer and fall interval. The QDT amplitudes are found to be much smaller (< 3 m/s) than the longer period tidal components most of the times of the year consistent with the previous investigations carried out from various locations over the globe. The vertical wavelength is found to reach up to 80 km in the MLT maximizing in winter although most of the times it remains within 20 km. Therefore, based on the observed characteristics of the QDT, it is surmised that both the migrating and nonmigrating components are involved in manifestation of the QDT at present locations. Further detailed investigations are sought in connection with the important issues pertained to the actual excitation mechanisms and existing dominant QDT modes in the low-latitude MLT.http://link.springer.com/article/10.1186/s40623-018-0910-9Quarterdiurnal tideMesosphere and lower thermosphereMeteor radar observations |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Amitava Guharay Paulo Prado Batista Ricardo Arlen Buriti Nelson Jorge Schuch |
spellingShingle |
Amitava Guharay Paulo Prado Batista Ricardo Arlen Buriti Nelson Jorge Schuch On the variability of the quarter-diurnal tide in the MLT over Brazilian low-latitude stations Earth, Planets and Space Quarterdiurnal tide Mesosphere and lower thermosphere Meteor radar observations |
author_facet |
Amitava Guharay Paulo Prado Batista Ricardo Arlen Buriti Nelson Jorge Schuch |
author_sort |
Amitava Guharay |
title |
On the variability of the quarter-diurnal tide in the MLT over Brazilian low-latitude stations |
title_short |
On the variability of the quarter-diurnal tide in the MLT over Brazilian low-latitude stations |
title_full |
On the variability of the quarter-diurnal tide in the MLT over Brazilian low-latitude stations |
title_fullStr |
On the variability of the quarter-diurnal tide in the MLT over Brazilian low-latitude stations |
title_full_unstemmed |
On the variability of the quarter-diurnal tide in the MLT over Brazilian low-latitude stations |
title_sort |
on the variability of the quarter-diurnal tide in the mlt over brazilian low-latitude stations |
publisher |
SpringerOpen |
series |
Earth, Planets and Space |
issn |
1880-5981 |
publishDate |
2018-08-01 |
description |
Abstract The characteristic features of the quarterdiurnal tide (QDT) in the mesosphere and lower thermosphere (MLT) are investigated using meteor radar observations from three low-latitude southern hemispheric stations, Sao Joao do Cariri (7.4°S, 36.5°W), Cachoeira Paulista (22.7°S, 45°W) and Santa Maria (29.7°S, 53.7°W) in 2005. The QDT shows consistent appearance with a weak enhancement during late summer and fall interval. The QDT amplitudes are found to be much smaller (< 3 m/s) than the longer period tidal components most of the times of the year consistent with the previous investigations carried out from various locations over the globe. The vertical wavelength is found to reach up to 80 km in the MLT maximizing in winter although most of the times it remains within 20 km. Therefore, based on the observed characteristics of the QDT, it is surmised that both the migrating and nonmigrating components are involved in manifestation of the QDT at present locations. Further detailed investigations are sought in connection with the important issues pertained to the actual excitation mechanisms and existing dominant QDT modes in the low-latitude MLT. |
topic |
Quarterdiurnal tide Mesosphere and lower thermosphere Meteor radar observations |
url |
http://link.springer.com/article/10.1186/s40623-018-0910-9 |
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